3,546 articles
Floyd Collins
Floyd Collins (William Floyd Collins, 1887-1925), Kentucky cave explorer who discovered Crystal Cave in 1917 and died trapped in Sand Cave in 1925 after a 17-day rescue that became a national media spectacle.
Fogo (volcano)
Fogo (Pico do Fogo) is Cape Verde's active 2,829 m stratovolcano, the archipelago's only historically erupting island, with a 9-km breached caldera, flank-collapse history, and 2014-2015 eruption destroying Portela and Bangaeira.
Foho Tatamailau
Foho Tatamailau, also called Mount Ramelau or Tata Mailau, is Timor-Leste's and Timor island's highest peak at 2,963 m, in Ainaro and Ermera municipalities, a Mambai sacred mountain, Marian pilgrimage site, and 20,000-ha national park.
Foley Island
Foley Island (Nunavut) is a 637 km2 low-lying Arctic island in Foxe Basin off southern Baffin Island, discovered by 1948 aerial surveys; distinct from smaller Foley Islands in New Brunswick and Ontario.
Ford Island
Ford Island (Moku'ume'ume) is a 441-acre islet in Pearl Harbor's East Loch, O'ahu, site of Battleship Row and the naval air station attacked on December 7, 1941; today it hosts the USS Missouri, USS Utah and Oklahoma memorials, and the Pearl Harbor Aviation Museum.
Ford Ranges
Ford Ranges (Edsel Ford Ranges): mountain group in western Marie Byrd Land, Antarctica, east of the Sulzberger Ice Shelf; discovered by Byrd's expedition on 5 December 1929 and named for patron Edsel Ford.
Foremost Formation
Foremost Formation: basal formation of the Belly River Group in southern Alberta, Canada, named by Dowling (1915). Sandstone, siltstone, and coal deposited paralic to fluvial during the Claggett regression, overlain by the Oldman Formation.
Forest of Dean
The Forest of Dean, also called the Royal Forest of Dean, is a historic royal forest and wooded plateau in west Gloucestershire, England, between the rivers Wye and Severn.
Formentera
Formentera, the smallest inhabited Balearic island (83 km², Pityusic Islands with Ibiza), has no airport and is reached by ferry. Known for Ca na Costa megalithic tomb, UNESCO-listed Posidonia meadows, and vehicle limits under Law 7/2019.
Forøya
Forøya is the name of several Norwegian islands and islets, including one in Kvæfjord, Troms (82 m), one in Aure, Møre og Romsdal, a protected pine-forest reserve in Senja, and gannet islands near Bleik, Nordland.
Fortunate Isles
Fortunate Isles (Fortunatae Insulae, makáron nêsoi): mythical Atlantic paradise islands of Greco-Roman tradition, from Hesiod to Ptolemy's six islands, most closely identified with the Canary Islands.
Fossilized forest
Fossilized forest, or petrified forest, an assemblage of ancient trees preserved in growth position or as logs, formed by rapid burial and permineralization; examples include Cairo (385 Ma), Gilboa, Gallatin, and Axel Heiberg.
Fournaise, Piton de la
Piton de la Fournaise is a highly active basaltic shield volcano on Réunion, rising to 2,632 m and erupting about twice a year since 1998.
Fourpeaked
Fourpeaked (Fourpeaked Mountain), glacier-covered stratovolcano in Katmai National Park, Alaska, 2,104 m. Its first historical eruption, a 6-km phreatic plume, came 17 September 2006, driven by magma intrusion at ~5 km depth.
Fourteener
Fourteener (14er): a Western US mountain peak of at least 14,000 ft (4,267 m) considered independent by prominence rules. 96 qualify under the 300-foot rule: Colorado 53, Alaska 29, California 12, Washington 2.
Fox Mountain
Fox Mountain names several North American features: the 2,404 m highest peak of Yukon's Pelly Mountains, a 5,165-ft roadless-area summit in Los Padres National Forest, California, and the Southeastern Cave Conservancy's largest Georgia cave purchase.
Foxe Peninsula
Foxe Peninsula, southwestern Baffin Island, Nunavut, Canada, between Foxe Basin and Hudson Strait; treeless permafrost shield with the Foxe Moraine, marine limit 192 m, final deglaciation 7.1–6.9 cal. ka BP.
Foyn Coast
Foyn Coast: stretch of the east coast of the Antarctic Peninsula between Cape Alexander and Cape Northrop, discovered 1893 by C.A. Larsen and named for Norwegian whaler Svend Foyn; formerly Foyn Land.
Francis Island
Francis Island (弗朗西斯島), Antarctic island off the east coast of Graham Land, 22 km ENE of Choyce Point; 13 km long, 9 km wide, named 1947 by FIDS for surveyor S.J. Francis; distinct from Francis Islands in Ontario, Kerguelen, and Chile.
Franz Josef Land
Franz Josef Land (Zemlya Frantsa-Iosifa), a Russian Arctic archipelago of 192 islands at about 80°N, the northernmost land of Eurasia, about 85% glaciated, discovered in 1873 by the Austro-Hungarian Payer-Weyprecht expedition and named for Emperor Franz Joseph I.
Fraser Plateau
Fraser Plateau: elevated basalt-capped plateau in central British Columbia, part of the Interior Plateau, bisected by the Fraser River into the Chilcotin and Cariboo plateaus; named for explorer Simon Fraser.
French Federation of Speleology
The French Federation of Speleology (Fédération Française de Spéléologie, FFS) is France's national federation for caving, canyoning, and underground diving, founded in 1963 at Millau and uniting about 380 clubs.
Fridtjof Island
Fridtjof Island (Fridtjof, Isla; Îlot Fridtjof) is a small island in Gerlache Strait off Wiencke Island, Palmer Archipelago, Antarctica, charted by the Belgian Antarctic Expedition in February 1898 and named, probably for explorer Fridtjof Nansen.
Frisian Islands
Frisian Islands, also called Wadden Islands: barrier island chain from the Netherlands through Germany to Denmark, divided into West, East, and North Frisian groups, sheltering the Wadden Sea UNESCO World Heritage tidal flats.
Frosty
Frosty, or Frosty Peak, is a dormant stratovolcano of the Cold Bay volcanic complex on the Alaska Peninsula, 15 km southwest of Cold Bay; westernmost Holocene volcano there, with two coalescing summit craters and no confirmed historical eruptions.
Fuerteventura
Fuerteventura, the second largest and oldest Canary Island, is Spain's driest and flattest major island: 1,661.3 km², 129,541 residents (2025), Pico de la Zarza 807 m, UNESCO Biosphere Reserve since 2009, conquered 1402–1405, famous for Corralejo dunes and Majorero cheese.
Funafuti
Funafuti is the capital atoll of Tuvalu in the South Pacific (8°30′S, 179°12′E), site of the 1896–1898 Royal Society drilling tests of Darwin's atoll theory, home to about 60% of Tuvaluans, and a global focal point for sea-level rise research and coastal adaptation.
Furness
Furness, also known as the Furness Peninsula or Low Furness, is a peninsula in Cumbria, England, between the Irish Sea and Morecambe Bay; its main town is Barrow-in-Furness.
Fuyul Sojol
Fuyul Sojol (Gunung Sodjol) is an ultra-prominent peak in the Ogoamas mountains, Central Sulawesi, Indonesia; sources give 2,765–3,030 m elevation and 2,713 m prominence, the region's highest summit.
Fyn
Fyn (Funen, Fyen) is Denmark's third-largest island, about 3,099.7 km², between Zealand and Jutland, centered on Odense, Hans Christian Andersen's birthplace, linked by the Great Belt and Little Belt bridges.